void __init update_e820(void)
{
u32 nr_map;
nr_map = e820.nr_map;
if (sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &nr_map))
return;
e820.nr_map = nr_map;
printk(KERN_INFO "modified physical RAM map:\n");
e820_print_map("modified");
}
/**
* Because of the size limitation of struct boot_params, only first
* 128 E820 memory entries are passed to kernel via
* boot_params.e820_map, others are passed via SETUP_E820_EXT node of
* linked list of struct setup_data, which is parsed here.
*/
void __init parse_e820_ext(struct setup_data *sdata, unsigned long pa_data)
{
u32 map_len;
int entries;
struct e820entry *extmap;
entries = sdata->len / sizeof(struct e820entry);
map_len = sdata->len + sizeof(struct setup_data);
if (map_len > PAGE_SIZE)
sdata = early_ioremap(pa_data, map_len);
extmap = (struct e820entry *)(sdata->data);
__append_e820_map(extmap, entries);
sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
if (map_len > PAGE_SIZE)
early_iounmap(sdata, map_len);
printk(KERN_INFO "extended physical RAM map:\n");
e820_print_map("extended");
}
/*
* Sanitize the e820 table from BIOS, and then copy it a safe place: e820_bios.
* If we have an empty e820 table, we do not fake one, just panic.
*/
void __init setup_memory_map(void)
{
u32 new_nr;
new_nr = boot_params.e820_nr_entries;
sanitize_e820_map(boot_params.e820_map,
ARRAY_SIZE(boot_params.e820_map),
&new_nr);
boot_params.e820_nr_entries = new_nr;
if (append_e820_map(boot_params.e820_map, boot_params.e820_nr_entries) < 0)
panic("e820: BIOS provides us *nothing*");
memcpy(&e820_bios, &e820, sizeof(struct e820map));
printk(KERN_INFO "e820: BIOS-provided physical RAM map:\n");
e820_print_map("BIOS-e820");
}
static __init void parse_cmdline_early (char ** cmdline_p)
{
char c = ' ', *to = command_line, *from = COMMAND_LINE;
int len = 0;
int userdef = 0;
for (;;) {
if (c != ' ')
goto next_char;
#ifdef CONFIG_SMP
/*
* If the BIOS enumerates physical processors before logical,
* maxcpus=N at enumeration-time can be used to disable HT.
*/
else if (!memcmp(from, "maxcpus=", 8)) {
extern unsigned int maxcpus;
maxcpus = simple_strtoul(from + 8, NULL, 0);
}
#endif
#ifdef CONFIG_ACPI
/* "acpi=off" disables both ACPI table parsing and interpreter init */
if (fullarg(from,"acpi=off"))
disable_acpi();
if (fullarg(from, "acpi=force")) {
/* add later when we do DMI horrors: */
acpi_force = 1;
acpi_disabled = 0;
}
/* acpi=ht just means: do ACPI MADT parsing
at bootup, but don't enable the full ACPI interpreter */
if (fullarg(from, "acpi=ht")) {
if (!acpi_force)
disable_acpi();
acpi_ht = 1;
}
else if (fullarg(from, "pci=noacpi"))
acpi_disable_pci();
else if (fullarg(from, "acpi=noirq"))
acpi_noirq_set();
else if (fullarg(from, "acpi_sci=edge"))
acpi_sci_flags.trigger = 1;
else if (fullarg(from, "acpi_sci=level"))
acpi_sci_flags.trigger = 3;
else if (fullarg(from, "acpi_sci=high"))
acpi_sci_flags.polarity = 1;
else if (fullarg(from, "acpi_sci=low"))
acpi_sci_flags.polarity = 3;
/* acpi=strict disables out-of-spec workarounds */
else if (fullarg(from, "acpi=strict")) {
acpi_strict = 1;
}
#ifdef CONFIG_X86_IO_APIC
else if (fullarg(from, "acpi_skip_timer_override"))
acpi_skip_timer_override = 1;
#endif
#endif
#ifndef CONFIG_XEN
if (fullarg(from, "disable_timer_pin_1"))
disable_timer_pin_1 = 1;
if (fullarg(from, "enable_timer_pin_1"))
disable_timer_pin_1 = -1;
if (fullarg(from, "nolapic") || fullarg(from, "disableapic")) {
clear_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability);
disable_apic = 1;
}
if (fullarg(from, "noapic"))
skip_ioapic_setup = 1;
if (fullarg(from,"apic")) {
skip_ioapic_setup = 0;
ioapic_force = 1;
}
#endif
if (!memcmp(from, "mem=", 4))
parse_memopt(from+4, &from);
if (!memcmp(from, "memmap=", 7)) {
/* exactmap option is for used defined memory */
if (!memcmp(from+7, "exactmap", 8)) {
#ifdef CONFIG_CRASH_DUMP
/* If we are doing a crash dump, we
* still need to know the real mem
* size before original memory map is
* reset.
*/
saved_max_pfn = e820_end_of_ram();
#endif
from += 8+7;
end_pfn_map = 0;
e820.nr_map = 0;
userdef = 1;
}
else {
parse_memmapopt(from+7, &from);
userdef = 1;
}
}
#ifdef CONFIG_NUMA
if (!memcmp(from, "numa=", 5))
numa_setup(from+5);
#endif
if (!memcmp(from,"iommu=",6)) {
iommu_setup(from+6);
}
if (fullarg(from,"oops=panic"))
panic_on_oops = 1;
if (!memcmp(from, "noexec=", 7))
nonx_setup(from + 7);
#ifdef CONFIG_KEXEC
/* crashkernel=size@addr specifies the location to reserve for
* a crash kernel. By reserving this memory we guarantee
* that linux never set's it up as a DMA target.
* Useful for holding code to do something appropriate
* after a kernel panic.
*/
else if (!memcmp(from, "crashkernel=", 12)) {
unsigned long size, base;
size = memparse(from+12, &from);
if (*from == '@') {
base = memparse(from+1, &from);
/* FIXME: Do I want a sanity check
* to validate the memory range?
*/
crashk_res.start = base;
crashk_res.end = base + size - 1;
}
}
#endif
#ifdef CONFIG_PROC_VMCORE
/* elfcorehdr= specifies the location of elf core header
* stored by the crashed kernel. This option will be passed
* by kexec loader to the capture kernel.
*/
else if(!memcmp(from, "elfcorehdr=", 11))
elfcorehdr_addr = memparse(from+11, &from);
#endif
#if defined(CONFIG_HOTPLUG_CPU) && !defined(CONFIG_XEN)
else if (!memcmp(from, "additional_cpus=", 16))
setup_additional_cpus(from+16);
#endif
next_char:
c = *(from++);
if (!c)
break;
if (COMMAND_LINE_SIZE <= ++len)
break;
*(to++) = c;
}
if (userdef) {
printk(KERN_INFO "user-defined physical RAM map:\n");
e820_print_map("user");
}
*to = '\0';
*cmdline_p = command_line;
}